Atoms
The negative charge in an atom.
What is an electron?
He created the Plum Pudding Model
Who is JJ Thomson?
A neutron becomes a proton and an electron is released.
What is Beta decay?
A new substance formed as a result of a chemical reaction.
What is a product?
A number placed in front of a chemical formula to balance an equation.
What is a coefficient?
The positive charge in an atom.
What is a proton?
The model that first included an internal structure.
What is the plum pudding model?
The time it takes for half of a radioactive substance to decay.
What is half-life?
A substance that is present at the start of a chemical reaction.
What are reactants?
A representation using symbols and numbers to show the atoms in a compound.
What is a chemical formula?
The maximum number of electrons in the second shell.
What is 8?
An isotope with an unstable nucleus that decays over time.
What is a radioactive isotope?
A reaction where atoms are rearranged to form one or more new substances.
What is a chemical reaction?
An equation with the same number of each atom on both sides.
What is a balanced equation?
This is calculated by, number of protons + neutrons.
What is mass number?
He discovered that electrons have specific energy levels.
Who is Bohr?
High-energy waves are released without changing the element’s structure.
What is Gamma decay?
A change in appearance, state, or form that does not create a new substance.
What is a physical change?
A system where matter (e.g. gas) can enter or leave during the reaction.
What is an open system?
The ratio (1/1836).
What is the mass of an electron?
The name for the unique pattern of colours that elements release.
What is the spectral fingerprint?
The isotope that is used for dating fossils and ancient remains.
A substance separated from a solution by a chemical or physical change.
What is a precipitate?
Mass cannot be created or destroyed, though it may be transformed from one form to another.
What is the Conservation of Mass?